In blast furnaces, the chute is the key device determining burden distribution. The effects of the chute's geometric and operational parameters on burden distribution have seldom been studied. Herein, the top of a bell‐less blast furnace is modeled based on the discrete element method to investigate the effects of chute length, stock‐line level and chute angle on particle movement, and radial burden distribution. The results indicate that burden particles are more likely to slide toward the opposite to the rotating direction as the chute length or angle increases. The burden distribution segregation is mainly caused by the segregation of particle velocity on the chute and the percolation of pellet on the chute. The burden tends to aggregate with increases in chute length and disperse with increases in stock‐line level or chute angle.
Blast parameters are easy to be changed and are often applied to control the gas distribution in blast furnace. However, the effects of blast parameters on the gas and solid distribution characteristics were seldom investigated. Therefore, a 3D model considering gas and solid fluid phases is developed and used to analyze effects of blast parameters on the gas and solid distributions in the blast furnace B of Baiyi Steel. The results show that the gas temperature increases a little in the lower part while decreases in the middle and top parts of blast furnace when the oxygen enrichment ratio and blast temperature increase. The CO utilization ratio increases with the increase of oxygen enrichment ratio, humidified blast amount and blast temperature, and it increases most for the case of blast temperature. The metallization ratio at the bottom of the blast furnace increases with the increase of oxygen enrichment ratio and humidified blast amount while it decreases with the increase of gas temperature.
In order to solve the problem of poor gas permeability of blast furnace caused by high Al 2 O 3 content in the burden, the softening and melting properties of sinter, pellets and lump ores are studied in this paper. The results show the differences between acid and basic iron ore materials. Based on this, this article study the influence of different kinds of pellets and lump ores blending with sinter on the softening and melting properties of comprehensive burdens. The results show that the self-fluxing pellet and porous lump ore with high aluminium content caused the Al 2 O 3 content of comprehensive burden to raise 0.26% compared to acid pellet and dense lump ore with low aluminium content. However, the highest pressure drop of comprehensive burden is reduced from 2.50 kPa to 1.70 kPa, the S-value is decreased from 198 kPa•°C to 114 kPa•°C. Therefore, this method of ore blending will improve the softening and melting properties of integrated burden.
Adopting conventional sintering process of vanadium-titanium magnetite concentrates has such problems as low tumbler index and RDI due to the high-TiO 2 content, coarse granularity and poor hydrophilicity. In this experiment, vanadium-titanium magnetite (VTM) is treated by the composite agglomeration process to prepare blast furnace burden and the resulting sinter performance is compared with conventional sintering process. Compared to the sinter with VTM proportion of 15wt%, the productivity and RDI+3.15 of the CAP product with the same VTM proportion are 0.45t/ (m 2 •h) and 6.39% higher, respectively. The effects of pelletized feed proportion (PFP), pelletized feed size and pelletized feed basicity on agglomeration indexes of CAP are also studied. The results show that the optimal PFP, pelletized feed size and pelletized feed basicity are 15wt%, 5~8mm and 0.9, respectively. Vanadium-titanium magnetite composite agglomeration process not only improves the quality and quantity indices of sinter, but also optimizes the melting and dripping properties.
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